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Full text of "The Cambridge Natural History"

CHAP.   XIII

DOG'S SKULL

387

SUB-ORDEB  1.     FISS1PEBIA.

A very marked feature of the  terrestrial  Carnivoxa  is  to  lie
found   In   the   structure  of   the  teeth.      The  incisors  are   nearly

always six, and are somewhat feebly developed in many cases.     The

390."LTntler surface of tl:e
crmiiium nf a "Dap. x A. &f*f>
Anterior palatine foramen ; ./I*S
alL-jphenoicl ; w, ]/ "-tenor open-
lug of alip!ieTiniu umal ; MUt
hasioeeipital; //% bafeispfaenoi*?;
& condylar fora^ea ; caw* ex.
teraal a.im;tc-ry ii^eatus ; jfiT.rO,
esocclpita! ; ./f-;v\ /f/* foramen
lacttrun; mttdiuro and posterius ;
,/V?j, forarnieii inagiium ; j^o9 fora-
men ovale ; J*V, frontal; frt
fcsranifeB rotuB*lTim ; g,?% glenoid
fossa ; 7p, post-gleiioi*! procesx ;
3jfcz, malar; 3fx, maxilla j oc,
occipital condyle ; t^p, optic fora-
iiteu ; J*er9 mastoid portion x>f
perlotic ; pgf^ po^-t-glenoid fora-
men ; JP/, palatine ; PJf, pre-
Hiaxilla; J?p paroccipita.1 pro-
cess ; jR|3^ posterior palatine
foramen ; JPS, presphenoid; JPtv
pterygoid ; qft spbenoidal fissure
or foramen lacerum anteiiias;
sin, stylomastold foramen ; SO,
supraocclpital ; J5g9 zygomafcic
process of ^uamosal ; Ty% tyra-
panic bulla. ; Fb Tomer. (From
Flower's

mnines are almost invariably very large strong teeth,, and are
always present. In some of the extinct Cats they reached
enormous dimensions. The number of cheek teeth is not always
identical; but the last premolar In the tipper jaw and the first true
aaoiar in the lower jaw3 known as the ** carnassial ** or " sectorial **
je6thf mark a difference in structure between the anterior and
ihe posterior crushing teeth; those in front of the carnassial
jooth have cutting edges, and are often, merely small, conical
>eeth; those behind have broader crowns and axe. tuberculate;
/hose of simpler forms often trituberoolate; thoae of